canattofilipe

Code is clean if it can be understood easily – by everyone on the team. Clean code can be read and enhanced by a developer other than its original author. With understandability comes readability, changeability, extensibility and maintainability.

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General rules

1. Follow standard conventions.
2. Keep it simple stupid. Simpler is always better. Reduce complexity as much as possible.
3. Boy scout rule. Leave the campground cleaner than you found it.
4. Always find root cause. Always look for the root cause of a problem.

Design rules

canattofilipe

const y = (text) => {
  return `this is the text "${text}"`;
};

console.log(y("Hi"));

canattofilipe

function execute(fn, ...params) {
  return function (text) {
    return `${text} ${fn(...params)}`;
  };
}

function sum(a, b, c) {
  return a + b + c;
}

canattofilipe

// A pure function is a function that the returned value
// is determined ONLY by the input values
// without side effects (change things out of function scope)

const PI = 3.14;

// example of impure function (PI is a external thing)
function circleArea(radius) {
  return radius * radius * PI;
}

canattofilipe

public class Pessoa {

	String nome;
	String sobrenome;

	public Pessoa(String nome, String sobrenome) {
		super();
		this.nome = nome;
		this.sobrenome = sobrenome;
	}

canattofilipe

// sort arrayList of objects with java 8

List<User> users = new ArrayList<>();

users.add(new User(10L, "Jon"));
users.add(new User(120L, "Robb"));
users.add(new User(190L, "Sansa"));
users.add(new User(100L, "Arya"));
users.add(new User(150L, "Bran"));